<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <h1>修改商品页面</h1>
  <input type="text" v-model="product.id"><br>
  <input type="text" v-model="product.title"><br>
  <input type="text" v-model="product.price"><br>
  <input type="text" v-model="product.num"><br>
  <input type="button" value="修改商品" @click="update()">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
    let v = new Vue({
        el: 'body>div',
        data: {
            product:{id:"",title:"",price:"",num:""}
        },
        methods: {
            update(){
                axios.post("/update",v.product).then(function (response){
                    alert("修改完成!");
                    location.href="/list.html";//返回列表页面
                })
            }
        },
        created:function (){
            //发请求获取修改商品的信息 location.serch得到?以及参数  ?id=3
            axios.get("/selectById"+location.search).then(function (response){
                v.product = response.data;
            })
        }
    })
</script>
</body>
</html>